1983 mercruiser 305 water in oil questions

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johnmoerke

Recruit
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Aug 30, 2011
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I have a 1983 mercruiser 898 with 305cid that i just tried to take out for first time in two years, ended up with lots of water in oil, what are the odds of cracked block? should i have it rebuilt, or repower with a 350? will the existing outdrive handle more power? help please. also what do i have to do to remove motor do i seperate at bell housing or at the piece farther back?
 
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dollarten

Petty Officer 2nd Class
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Jul 28, 2011
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Re: 1983 mercruiser 305 water in oil questions

johnmoerke said:
I have a 1983 mercruiser 898 with 305cid that i just tried to take out for first time in two years, ended up with lots of water in oil, what are the odds of cracked block? should i have it rebuilt, or repower with a 350? will the existing outdrive handle more power? help please. also what do i have to do to remove motor do i seperate at bell housing or at the piece farther back?[/QUOTE Odds are good , if block cracked exhaust mainifolds are cracked too if a freeze crack , no to rebuild , 350 might be OK but you are running into gear ratio differences , yes the drive will hold the power , Bell housing comes out with engine , remove two big bolts in back by bell housing
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johnmoerke

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Aug 30, 2011
Messages
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Re: 1983 mercruiser 305 water in oil questions

thanks, how will the shaft seperate when i remove the two big bolts and lift engine up? looks like it has to come up 1 1/2" before it can go ahead, will it just slip apart like a drive line? also curious i had 30 psi oil pressure and water in the oil but no oil anywhere else including the lake????
 
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Aatcman

At-Sea-Man
Joined
Aug 20, 2004
Messages
166
Re: 1983 mercruiser 305 water in oil questions

You will have to pull the drive first... Then the shaft won't even be there :)
 
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